Pro Tools - Client Seat Stereo Setup ProTools 2018

Open ProTools but when the splash screen opens don't create a new session choose cancel

Don't create a new session here you need to choose Cancel and setup the playback engine first!!

After hitting Cancel go to >Setup>Playback Engine

Playback Engine
Choose Built-in Output

Next go to >File Create New

Choose a Name for your session

Choose the file type as .wav
Bit Depth 24
Sample Rate 48

I/O settings Stereo Mix

Choose where to save the session
Click Create!

After this should hear audio out the headphone Jack